lunes, 5 de junio de 2017

Plastics Process Selection - Materials Types



Not all materials can be processed in the same way. Some materials cannot, in fact be processed by certain methods. There are often other restrictions on the processing of certain materials by certain processes - PVC-U can be easily injection moulded but processors are sometimes wary of using PVC-U in injection moulding machines because of the tendency to suffer high wear and corrosion of the machine and tooling.


Compatibility of thermoplastics




The Ashby diagram for temperature and strength


Prof. M. Ashby at the University of Cambridge, UK has developed a very easy and visual method of materials selection and this can help in making the choice of which material to use at high temperatures. A typical Ashby chart for strength at failure (σf) versus maximum service temperature (Tmax) is shown below.